Neon lights are tubes filled with gas, with an electric current running through them. The electric current excites the electrons in the gas to produce the bright light that you see. Neon, in particular, gives off a bright glow. "Neon" lights aren't actually made of only neon. These lights use the noble gasses: argon, helium, xenon, and krypton. The only noble gas not used is radon. This is what neon light is made of.
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